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For
rapid measurements in the field,
when independence from the mains
and a high degree of immunity
against various interference is
needed, this ohmmeter is ideally
suitable.
Low resistance measurements are
performed simply in
manufacturing, in testing, in the
service as well as in the field
using this portable
milli-ohmmeter. It is powered
either by mains or by built-in
NC-batteries. In connection with
the simple operation, this
practical and robust instrument
can be used universally.
The temperature of the test
object (i.e. of a cable during
manufacturing) may be taken by a
Pt 100 temperature probe and
considered in the test result. In
this case the resistance value
related to 20°C will be
displayed.
To
show the many applications of the
milli-ohmmeter, some typical test
objects are mentioned below:
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Transformers,
chokes and coils |
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Motors,
cables and wires |
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Switches,
relays and contacts |
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Transfer,
resp. contact resistances and
fuses |
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Electrical
components of various kinds |
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Surface
connections of mechanical parts,
etc. |
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| Description |
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This milli-ohmmeter
operates in the well known ratio mode. It
employs the proven 4-wire measurement
method by Kelvin to cancel any lead
resistance errors inherent in less
sophisticated 2-wire systems. The
measuring result is displayed directly in
mOhm, Ohm or kOhm on a 3 1/2 digit
LCD-display.
Any of the 8 measuring ranges can be
selected by a key.Terminals not
connected, as well as a measuring range
chosen too small, will result in the
display of a „1" and a decimal
point.
When measuring test objects made from
copper (Cu) or aluminium (Al), it is
possible to verify the so-called
VDE-value.
This is the resistance of the specimen
related to 20 °C. To verify the
VDE-value the temperature compensation
has to be switched on and an usual Pt 100
probe - which must be exposed to the
temperature of the test object - has to
be connected. The measuring result then
automatically corresponds to the
VDE-value.
In addition to the power supply and the
NC-batteries, the charging circuit is
integrated in the unit. The NC-batteries
are protected against high and low
charge. In case of low batteries the
display shows „LOBAT". The
unit, of course, may be operated from the
mains.
The milli-ohmmeter is a rugged instrument
designed to perform reliably. It is
surrounded by an extremely sturdy and
wellshaped case. A carrying handle allows
the ohmmeter to be operated portably. It
can also be used to position the angle of
the instrument.
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